KHK SW0.5-R2, Module 0.5, Double Lead, Right Hand, Carbon Steel Worms
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KHK SW0.5-R2 is a compact, double-start right-hand steel worm for small worm-drive extruder and motion projects that specify the KHK SW series. Module 0.5, 2 starts, 5 mm bore, and 18 mm overall length make it a very small precision drive part—not a generic hobbed pulley or printed substitute.
Why this part
- Exact KHK catalog part: SW0.5-R2, the right-hand, double-start version of KHK’s SW carbon-steel worm series.
- Fine module drive: module 0.5 with a nominal lead angle of 5°13′ for compact worm gear reductions.
- Machined steel body: S45C / AISI 1045 carbon steel with black oxide coating except on ground areas.
- Serviceable mounting: 5 mm bore with an M3 set-screw hole.
Specifications
- Manufacturer / MPN: KHK SW0.5-R2
- Gear type: worm gear / worm
- Module: 0.5
- Starts: 2 / double lead
- Hand of thread: right hand
- Material: S45C carbon steel (AISI 1045 equivalent)
- Precision grade: KHK W 001 grade 4
- Pressure angle: 20°, normal plane, standard full-depth teeth
- Bore: 5 mm; pitch diameter: 11 mm; outside diameter: 12 mm
- Face width: 10 mm; total length: 18 mm; set screw: M3
- Approx. weight: 0.01 kg
Fitment and pairing
Use this where your BOM or project notes call out KHK SW0.5-R2 specifically. Community listings call out Kyro-style extruder use and Annex DFA fitment, but worm gears are geometry-sensitive—match module, starts, hand, bore, and the mating worm wheel before ordering.
Looking at the adjacent KHK family? The live store also has the KHK DG0.5-40R1 module 0.5 acetal worm wheel; treat it as a related KHK module 0.5 part, not an automatic mate for this R2 worm.
What it is not
- Not a complete extruder kit.
- Not a generic brass worm or printed gear.
- Not interchangeable with single-start R1 worms unless your design explicitly allows it.
